17 research outputs found
Cytogenetics and biogeography: considerations about the natural origin of Hoplias malabaricus (Characiformes, Erythrinidae) on the Iguaçu river
The cascudos of the genus Hypostomus Lacépède (Ostariophysi: Loricariidae) from the rio Iguaçu basin
DNA barcode of Parodontidae species from the La Plata river basin - applying new data to clarify taxonomic problems
Systematics and geographical distribution of the genus Parotocinclus Eigenamnn & Eigenamnn, 1889 (Ostariophysi, Loricariidae)
Notes are given on the systematics, geographical distribution and ecology of the genus Parotocinclus. The species are redescribed and five new species (cristatus, amazonensis, jimi, cearensis and minutus) are described. Two well defined groups of species are recogyiized and an Amazonian origin for the genus is postulated, to explain the distribution along a long but narrow belt in eastern South America
Two New Southeastern Brazilian Genera of Hypoptopomatinae and a redescription of Pseudotocinclus Nichols, 1919 (Ostariophysi, Loricariidae)
Systematics of the genus Otothyris Myers 1927, with comments on geographic distribution (Siluriformes, Loricariidae, Hypoptopomatinae). American Museum novitates ; no. 3222
19 p. : ill. ; 26 cm.Includes bibliographical references (p. 18-19)."A revision of the genus Otothyris Myers, 1927, is presented on the basis of collections from the coastal river systems of southeastern Brazil. Otothyris is diagnosed among genera of the loricariid subfamily Hypoptopomatinae on the basis of autapomorphies of the cranial skeleton and caudal fin. Three new species are described and compared with the three nominal species of Otothyris, which are herein redescribed: Rhinelepis lophophanes Eigenmann and Eigenmann, 1889, is transferred to Otothyris under a new combination; Otocinclus cephalacanthus Ribeiro, 1911, and Otothyris canaliferus Myers, 1927, are junior synonyms of Otothyris lophophanes; we designate a lectotype from among the type series of O. canaliferus. Otothyris juquiae, n. sp. is described from the Juquiá River of the Ribeira de Iguape basin, São Paulo State; Otothyris rostrata, n. sp. is described from the coast of Rio Grande do Sul State; Otothyris travassosi, n. sp. is described from the isolated coastal rivers of Espírito Santo State. The species are compared by multivariate statistical analysis of morphometric characters, which distinguishes O. lophophanes and O. juquiae from O. rostrata and O. travassosi on the basis of variables with highest loadings on head depth, head width, and orbit diameter. We offer comments on the endemic distribution of the genus Otothyris in southeastern Brazil"--P. [1]
Two new species of Leporinus Agassiz (Characiformes: Anostomidae) from eastern basins of Brazil, and redescription ofL. melanopleuraG\ufcnther
Two new species of Leporinusare described from coastal rivers of southern Bahia, Brazil. One of the new species has a bright red blotch immediately dorsal to the pectoral-fin origin in life, three dark blotches along the lateral line that distinctly increase in size posteriorly, and dark longitudinal lines between scale rows on the side of body. The second new species possesses a single broad dark midlateral stripe, encompassing one or two scale rows of depth on the body and centered on the scale row below the lateral line, a dark adipose fin, and a conspicuous dark blotch on the caudal peduncle. The first new species is known only from the rio de Contas and the second from the rio das Almas and rio Jiquiriçá. In addition,Leporinus melanopleura is redescribed based on a designated lectotype and additional specimens collected in the rio Una. Leporinus melanopleurahas a single broad dark midlateral stripe, encompassing one or two scale rows of depth on the body, centered on the scale row below lateral line, a hyaline adipose fin (red in life), and an inconspicuous dark blotch on the caudal peduncle